Eureka（F 版本）教程三 服务消费者（Feign）

<parent>

<groupId>com.loren</groupId>

<artifactId>spring-cloud-demo</artifactId>

<version>1.0-SNAPSHOT</version>

</parent>

<groupId>com.loren</groupId>

<artifactId>serice-feign</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>serice-feign</name>

<packaging>jar</packaging>

<description>Demo project for Spring Boot</description>

<properties>

<java.version>1.8</java.version>

<spring-cloud.version>Greenwich.SR2</spring-cloud.version>

</properties>

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-openfeign</artifactId>

</dependency>

</dependencies>

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

</project>

在工程的配置文件 application.yml 文件，指定程序名为 service-feign，端口号为 8765，服务注册地址为 http://localhost:8761/eureka/ ，代码如下：

eureka:

client:

serviceUrl:

defaultZone: http://localhost:8761/eureka/

server:

port: 8765

spring:

application:

name: service-feign

在程序的启动类 ServiceFeignApplication ，加上 @EnableFeignClients 注解开启 Feign 的功能：

@SpringBootApplication

@EnableEurekaClient

@EnableDiscoveryClient

@EnableFeignClients

public class ServiceFeignApplication {

public static void main(String[] args) {

SpringApplication.run( ServiceFeignApplication.clas

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s, args );

}

}

定义一个 feign 接口，通过 @ FeignClient（“服务名”），来指定调用哪个服务。比如在代码中调用了 service-hi 服务的“/hi”接口，代码如下：

package com.loren.sericefeign.feign;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "service-client")

public interface SchedualServiceHi {

@RequestMapping(value = "/hi",method = RequestMethod.GET)

String sayHiFromClientOne(@RequestParam(value = "name") String name);

}

在 Web 层的 controller 层，对外暴露一个”/hi”的 API 接口，通过上面定义的 Feign 客户端 SchedualServiceHi 来消费服务。代码如下：

package com.loren.sericefeign.controller;

import com.loren.sericefeign.feign.SchedualServiceHi;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;